Floor furnace valve



June 2, 1942. c. s. STUCKENHOLT FLOOR FURNACE VALVE Filed June 27, 19412 Sheets-Sheet 1 A TTORNEYS.

June 2, 1942. c. s. STUCKENHOLT 2,284,995

FLOOR FURNACE VALVE Filed June 27, 1941 2 Sheets-Sheet 2 J9 45' 45 34 a426 MM 5 5 7-505 51 44 44 v 55 A TTORNEYS.

Patented June 2, 1942 FLOOR FURNACE VALVE Casper S. Stuckenholt,Cleveland, Ohio, assignor to The W. J.

Schoenberger Company, Cleveland, Ohio, a corporation of Ohio ApplicationJune 27, 1941,'Scrial No. 400,087

4 Claims.

This invention relates to improvements in valves, being particularlydirected to valves for use with floor furnaces.

The conventional floor furnace construction comprises a cast manifoldupon which is mounted two valves for supplying gas to a pilot and mainburner respectively. In order to meet requirements of the American GasAssociation laboratory, to the effect that means must be provided forpreventing the main burner valve from being turned on before the pilotvalve, it has been the practice to employ valves with special swivelsand a locking plate connecting one valve with the other. The use of thetwo valves embodying such special features as the locking plate andswivels has proven expensive and otherwise somewhat unsatisfactory.

One of the general objects of the present invention is to provide asingle valve capable of meeting the aforesaid requirements thuseliminating the locking plate.

A further object of the invention is to provide a valve of the abovecharacter with means for providing a high or a low volume flow of gas tothe main burner.

A further object of the invention is to provide means whereby the singlevalve is adapted for use either with an automatically or manuallyoperated furnace.

Other objects and advantages will be apparent as the description isconsidered in connection with the accompanying drawings wherein:

Figure 1 is a plan view of the improved plug valve -as used with amanually controlled furnace;

Figure 2 is a section taken on line 22 of Figure g Figure 3 is a sideelevation of the valve;

Figure 4 is a section taken on line 4--4 of Figure 1;

Figure 5 is a section taken on Figure 3;

Figure 6 is a plan view of the slotted valve;

Figure 7 is a fragmentary section of the slotted valve;

Figure 8 is a side view of the slotted valve;

Figure 9 is a plan view of the improved plug valve;

Figure 10 is a side view of the improved plug valve;

Figure 11 is a side view of the plug valve;

Figure 12 is a sectional view taken on line l2--l2 of Figure 10;

Figure 13 is a sectional view taken on line I3-l3 of Figure 10;

the line 55 of Figure 14 is an end view of the adjustable needle valve;

Figure 15 is a side view of the needle valve;

Figure 16 is a plan view of the lock washer;

Figure l'l'is a section on line ll-l'l of Figure 16;

Figure 18 is a bottom view of the flanged cap member;

Figure 19 is a perspective view of the flanged cap member;

Figure 20 is an end spring;

Figure 21 is a side view of the spring shown in Figure 20;

Figure 22 is a plan view of the locking plate:

Figure 23 is a side view of the locking plate;

Figure 24 is an end view of the valve stem;

Figure 25 is a partial sectional view of the valve stem swivel andoperating rod;

Figure 26 is a diagrammatic view of the improved valve and connectionsfor use with the thermostatic safety valve and associated parts of anautomatically controlled furnace; and

Figure 27 is a fragmentary sectional view of the improved plug valvewith the slotted needle valve and pipe assembled for use with anautomatically controlled furnace.

Referring more particularly to the drawings the improved valve comprisesa preferably cast valve housing or casing I, having therein a ver--tically disposed tapered plug receiving bore 2. Projecting rearwardly atright angles to the bore 2 is an enlarged hollow gas inlet extension 3,interiorly threaded as at 4 and provided with an upwardly extendingfastening flange 5. The extension 3 is adapted to be threadedlyconnected with the house gas supply line 64 of a manually controlledfurnace, not shown, and the flange 5 is provided with screw openings 6,to facilitate securing the valve to a suitable support such as the wallof a furnace, not shown.

Projecting outwardly from the front of the casing l, is a horizontallydisposed hollow exten-- sion 1 axially aligned with the bore ofrearwardly extending hollow extension 3. The outer end of the extensionI is provided with an adjustable threaded perforated cap 8, throughwhich gas will flow to the main burner, not shown, of the manuallycontrolled furnace referred to above. These oppositely projecting hollowextensions 3 and 1 communicate with the plug receiving bore 2 at theirouter and inner ends respectively, through aligned oppositely disposedopenings 22 and 23 in the casing.

A pair of parallel extensions or nipples 9 and view of the plug valvecoil l extend outwardly from the right side of the casing, when lookingtoward the front end of extension 1. The nipple 9 is adapted forconnection with a conventional pilot light, also not shown, 01' a mainburner 10, tor a manually con-- terior of hollow gas inlet extension 3,by means of a transverse passage H in axial alinement 20 when the plugvalve is appropriately rotated. In operation the valve plug is manuallyrotated by means of a valve stem 28 having its with the well 01' nipplei0, serves as a means for adjusting the rate or gas flow from the nippleIII, to the plug valve l6, through an inwardly and forwardly inclinedpassage 25, and finally through nipple 9 to the pilot burner. Thus thenipple I0 is provided with a needle valve l2 which is in turn entirelyenclosed and protected by means of a cap I3. This needle valve regulatesor adjusts the amount of gas flowing from inlet extension 3 into nippleI0 through transverse passage II and thence out through inclined passage25, in an obvious manner.

A second adjustment nipple l4, projecting from the left hand side of thecasing, or in a direction opposed to the pilot adjustment extension ornipple I0, provides for a predetermined low or simmer flame at the mainburner when the valve is moved to reduced flow or simmer position. Thisnipple I4 is internally threaded to receive a needle valve l5, similarto the valve I2. Gas flowing into the nipple l4, through an inclinedpassage [6, leading from hollow extension 3, to the well of nipple l4,continues through a horizontally disposed axial passage l1 leadinginwardly from the nipple to plug receiving bore 2, and finally to theapertured outlet nipple or extension 1, in a manner presently described.The volume of flow can be reduced to any desired predetermined minimumby screwing the needle valve inwardly in an obvious manner. A cap 26encloses and protects the needle valve l5 against tampering.

The tapered plug or valve [8 is adapted to be snugly but rotatablyreceived in the tapered bore 2 of the casing l. The valve plug is formedwith a large transverse opening l9, approximately midway of its length,and with a relatively small transverse opening leading to the largeropening I 9. The opening 20 extends at right angles to the opening orpassage l9 and in a plane which bisects the axis of the latterapproximately midway its length. The plug is also formed with aperipheral groove or passage 2|, extending around the lower end of theplug approximately 270 and is spaced downwardly-a substantial distancefrom the plug openings or passages I9 and 20. When the plug is seated inthe bore 2, the groove 2| therein will lie in a common plane with theinner ends of axial passage 24 and inclined passage 25, leadingrespectively from bore 2 to nipple 9 and from nipple III to bore 2, sothat these passages 24 and 25 will be in the path of movement of thegroove. Likewise the aligned main inlet and main outlet openings 22 and23 leading from the hollow extension 3 to the bearing surface of theplug receiving bore 2 and from the bore to and through the passage 50 ofextension 1, respectively lie in the path of movement of and are adaptedto be brought into and out of register with the plug passages l3 andlower or inner end extending into and interengaging with a hollowextension 29 formed on the outer end of the plug, the stem beingprovided with a socket member 30 swiveled thereto by means of pin 30.The member is formed with a'squared. opening 3|, adapted to receive thecorrespondingly squared lower end of a conventional and relatively longoperating rod or handle 58, which is manually manipulated from the floorabove. The movable socket member 30 facilitates the operation ofconnecting the long rod 58 to the stem and also affords sufiicientflexibility to prevent the valve from binding during movement from onestation to another. Hollow extension 29 is formed with two oppositelyarranged slots 32 and 33 of difl'erent width to slidably receive fingerportions 34 and 35 integrally formed on the inner or lower end of stem28, when the latter is partially inserted within the hollow extensionagainst the tension of a coil spring 39, seated in the hollow extension.The finger portions are proportioned to flt the slots 32 and 33 and areof different width to insure proper assembly. A locking plate or member40 seated on the coil spring between the latter and the end of the stem,is formed with fingers 44 and 45 of different length and width adaptedto be forced into interlocking engagement with the slots 32 and 33 bythe stem.

A flanged apertured cap member 36 sleeved over the valve stem is formedwith a depending flange 36" having apertured ears 3'! and 31' which seatupon and are secured to laterally extending apertured lugs 38 and 38'formed on the upper face of outer end of the casing I. A safety lockwasher 46 is interposed between the cap member 36 and the end face ofthe casing for a purpose presently described. The forwardly facingportion of the cap flange 36' is formed with a cut away portion orrecess 4| approximately midway between the two apertured ears 31 and 31'and adjoining this recess in stepped relation thereto is a second anddeeper cut out portion or recess 42 which extends to the apertured ear31'. One end of the recess 4| serves as a stop shoulder 43 for limitingmovement of the valve in a clockwise direction when the elongated arm 44of the locking plate 40, is moved thereagainst. The cap 36 is alsoformed with a depression 41 at the point of juncture between thedepending cap flange 36* and the apertured ear 31' and the inwardly orrearwardly facing portion of the flange is formed with a cut awayportion or recess 48. The recess 42 and the depression 41 serve torespectively lock and resiliently latch the valve against movement ineither direction when the locking and latching plate 40 reaches theserespective stations, while one end 49 of the cut away portion 48 servesas a stop wall to prevent further anticlockwise rotation of the valvewhen the latter is in position to permit a low flow of gas to theburner.

When the valve is in off or inactive position the arm 44 engages thestop shoulder 43 of recess 4| first active position and in which areduced flow of gas is delivered to the pilot light connection or nipple9. The pilot gas enters hollow casing extension 3 from the main gas line64 and thence flows into nipple l through small transverse passageaxially aligned therewith. From nipple H) the pilot gas flows throughthe inwardly and forwardly inclined passage 25, leading from the nippleIll and through the bearing surface of the vertical plug receiving bore2, formed in the casing I, where it is picked up by the plug slot orgroove 2| whichalso communicates with the transverse passage 24 leadingfrom the bore 2, to the nipple 9. Manual adjustment of the pilot flow,to compensate for different pressures and kinds of gases encountered invarious localities, can be readily made by removing the'cap |3 fromnipple l0 and screwing the needle valve l2 into or away from the outletend of passage according to whether it is desired to reduce or increasethe flow of gas to the pilot light.

In order to rotate the valve to its second active or full on position,in which a full flow of gas is delivered to the main burner, the stemmust be moved inwardly in an axial direction untilthe arm 44 clears theright hand wall of recess 42.

whereupon rotation of the valve in an anti-clockwise direction iscontinued until the operator is apprised, when he hears a slightclicking sound caused by the arm 44 being forced into the depression 41,that the desired full flow station has been reached. A full stream ofgas from inlet extension 3 will now flow through transverse plug passagel9, which is aligned with and places the plug inlet and outlet openings22 and 23 in communication with each other, and thence through theapertured extension I to the burner. In this position the long arm 44 ofplate 40 is resiliently latched in the depression 41 and the previouslydescribed flow of gas to the pilot continues.

Still further rotation of the valve plug in an anti-clockwise directionmay be eflected by merel'y overcoming the resistance offered by theresiliently pressed arm 44 against movement out of its latching positionagainst the tension of spring a 39. When the arm 44 engages thepreviously described shoulder 49 at one end of the cut away portion orrecess 48, anti-clockwise rotation of the plug will be definitelystopped. Gas will now flow from main inlet 3 through the small forwardlyand outwardly inclined passage l6 leading from the inlet 3 to thepredetermined low flow adjustment nipple l4 and thence inwardly throughan axial or transverse passage |'I leading from the nipple H to theinterior or large passage I9 of plug I8 and finally out through thesmall plug opening 20. The latter, at this time registers with theoutlet opening 23 in the casing leading to the gas passage 50 inextension I, which in turn is connected to the main burner. We now havea predetermined reduced flow of gas to or predetermined low flame at themain burner with gas also flowing to the main burner pilot. While themax mum flow of gas to and through the fitting or extension 1 in thisposition is much less than when the valve is in full or high position,any desired or finer minimum low flow adjustment may be made by merelyremoving the cap 26 and screwing the adjustment valve l5, in anappropriate direction.

It will be understood that when the valve plug 2 is in ofi' or closedposition, the small plug opening or passage 20, of the plug I8, willregister with the gas inlet extension 3 and the low flow adjustmentnipple or well M respectively. It will also be noted that in thisposition, the large passage i9 will be out of register with the opening23 leading to passage in extension I, the opening 23 being thus closed.At the same time, it will also be noted that forwardly and inwardlyinclined passage 25 leading from pilot flow adjustmentnipple H), to theplug receiving bore 2, is closed or blocked at the bore by that solidspace or area 59 of the plug extending between the opposite ends of thegroove 2|, and consequently no gas can flow to either the pilot or mainburner.

In the first active or pilot position the transverse passage leadingfrom the low flow adjustment nipple I4 to the plug bore is closed by thearea or space 66 .between the small passage 20 of the plug and one end6| of the larger plug passage IS, the small passage 20 being locatedsomewhat closer to the end 6| of passage l9 than to the other end 62thereof. Flow of gas from nipple I4 is thus closed and therefore no gascan reach the extension 'I or main burner from this source. The smallopening 20 will also have been moved slightly in a clock-wise directionout of register with the opening 22 connecting inlet 3 with the casingbore 2 and the larger area or space 63 between the small bore 20 and theend 62 of passage l9, will close the passage 23 leading to extension andthence to the main bumer. However the groove 2| will now bridge thespace between the passages 24 and 25 and permit gas from inlet 3 andnipple ID to reach nipple 9 and the pilot.

In the second or full flown position the passage t1 leading from nippleM to the bore 2 is closed by the space 63 and the full flow casing-andplug passages will be in alinement with each other thus permitting afull flow of gas direct from inlet 3 to the burner. As the plug groove2| continues to bridge the pilot flow passages 24 and 25 gas continuesto flow to the main burner pilot.

Further movement of the plug about ninety degrees in an anti-clockwisedirection moves the plug to its third active or low flow position withthe end 62 of passage I9 out of register with the full flow passage 22and into register with the low flow passage ll, without disturbing thecommunication between the plug groove 2| and the pilot flow passages 24and 25. The small low flow plug opening or passage 20 will now registerwith outlet passage 50 in extension I. A reversal of the above describedoperations will take place during return movements of the valve throughfull on and pilot flow back to closed position.

The lock washer 46 previously referred to herein, is provided withapertured ears 56, corresponding to the apertured ears 31 and 31' on thecap 36, to facilitate assembly on the casing lugs 38 and 38'. The washer46 is also formed with a depending horizontally disposed flange 5|,which is provided with a cut out portion or notch 51 corresponding insize to and in vertical alinement with the locking notch 42 of the cap36, Considerable difliculty was experienced with the present valve,prior to the adoption of the lock washer, due to the fact that whenshifting the valve stem axially in order to turn the valve plug from onestation to another, the operator would frequently miss the desiredstation. This was due to the fact that because of the necessity ofoperating the valve from a distance, through the medium of the longheavy and unwieldy rod 58, previously mentioned herein, it wasimpossible for the operator to hear the clicking of the locking plate40, or to otherwise accurately determine the exact location of the arm44 of this plate. By providing the flanged locking washer, it becomesnecessary for the operator to feel for the desired position thusobviating the likelihood of inadvertently passing the desired station bypressing down too hard on the rod 58, connected to the valve stem. As anillustration, when the plug valve is in the first active or pilot flowposition the long arm 44 of the plate 40 is seated in the locking notch'42, directly over the notch 51 in the flange of the lock washer.Consequently if much. pressure is exerted on the operating rod or handle58 the arm 44 will be forced into locking notch 51 and the valve willremain locked, and the operator will be definitely apprised as toposition and therefore can, by the exercise of reasonable care, rotatethe valve plug with certainty to any other desired active or in activeposition. Up to this point the specification corresponds with that of myco-pending application filed of even date herewith, Serial No. 396,765.

It frequently happens after a furnace has been in use for some time,that the user desires to install an automatic control, such asdiagrammatically illustrated in Figure 26, in lieu of the manual controlwith which the furnace was originally equipped. These automatic controlsinclude a conventional safety cut oil? thermostatically controlled valve65, in the main gas supply line 64, and through which gas must flowenroute to the casing inlet extension 3 and thence to the burner Ill.Gas taken from line 64 in advance of the inlet side of safety valve 65reaches nipple 9 and pilot light 61 in a manner presently described. Thesafety valve 65 shuts off the main supply of gas to a pipe 66, adaptedfor connecting the outlet side of this valve with the casing inlet 3,until a thermostatic element 68 of the automatic control becomes heatedand opens the safety valve. In other words gas is not permitted to flowto the main burner until after the pilot has been lit sufficiently longto heat the automatic control. Therefore it is extremely advantageousthat the floor furnace equipment be provided with means whereby it ispossible to conveniently convert from a manual to an automatic control.The pilot 6'! serves to light the main burner 10 in addition to itsother functions.

In order that the present invention may function with either type ofcontrol I provide the casing nipple It] with a special slotted screw 52and bushing 55 which can be readily substituted for the adjusting screwor needle valve l2 and cap I3 respectively, the method of assembly beingas follows: The cap l3, used on spud or nipple In, for enclosing andprotecting the pilot adjusting screw valve l2, as well as the screw l2are removed from nipple I0 and the slotted screw 52 is then screwed homein the nipple I0, until the inner pointed end 56 of the screw 52 seatsin and closes the transverse or axial passage ll, thus cutting off allflow of pilot gas from inlet extension 3 to nipple Ill. The specialbushing 55 is then assembled in place of the cap l3, and a delivery pipe55 leading from the main gas line 64 ahead of the automatic control formain fiow of gas through pipe 56, is then attached to the bushing. Asscrew 52 is formed with a longitudinal slot 53 which communicates at itsinner end with the well of nipple l0 and at its outer end with atransverse slot 54 in the head thereof, it follows that when the valveplug 2 is turned to its first active position pilot gas will flow fromthe delivery pipe 55' inwardly to the bushing 55 and through the slot 53to the bottom of nipple I0 and thence through the inclined passage 25 toplug groove 2| and finally through transverse passage 24 and pipe 21' tothe pilot 61. And since the pilot gas delivery pipe 55' is connected tothe main gas line ahead'of the automatic control valve 65, whichprevents flow of gas to inlet extension 3 until the pilot is lit, flowof pilot gas to .the pilot will be uninterrupted. The pilot may now belit and after the safety control element has been heated sufficiently toactuate the automatic valve forming part of the automatic control, theline 66 leading to extension 3 will be opened and gas will fiow to themain burner in the manner previously described as taking place undermanual control conditions.

In most cases the valve will be equipped at the factory with the needlevalve I2 and the slotted screw or fitting 52 shipped as an auxiliarymodified part. However for original installations on furnaces withautomatic controls the fitting 52 will be installed at the factory andthe needle valve I2 omitted entirely.

If deemed desirable the slotted screw 52 may be employed regardless ofwhether the valve is expected to be used with furnaces having a manualor an automatic control, care being taken in the case of manual controlfurnaces that adjustment of the screw 52, be such that flow of gas fromextension 3, through restricted passage I I, is not completely shut off.Of course the cap l3 must be screwed onto the nipple to prevent theescape of gas when nipple I0 is not directly connected to the gas line,whereas this is not absolutely necessary where the adjustment valve I2is used. However the screw adjustable valve 52 will function effectivelywhen gas to the pilot light is supplied either direct from the gas lineto the nipple ID or from inlet 3, except that the needle adjustment ofpilot gas flowing directly from the gas line to the nipple cannot beeffected. In either case the construction of the casing and plug valvewill remain the same, although it will be understood that the fitting 52is adapted for use with valves having variously modified flow positionswhere it is desirable to have the inlet extension 3 and the nipple l0connected at different places in the gas supply line relatively to asafety control or other element in the line.

Having thus described my invention:

What I claim is:

1. In an valve for floor furnaces having a piloto light in the main gasline, a casing formed with a plug receiving bore, a plug having arotatable bearing in said bore, said casing having inlet and outletconnections leading to and from said bore respectively, said inletconnection being adapted for connection with the main gas supply lineand said outlet connection being adapted for connection with the mixingtube of the burner of the furnace for conducting gas thereto, saidcasing having a pilot light extension provided with a restricted passageleading thereto from the bore, said extension leading to the pilot lightfor the main burner, a hollow nipple formed on the casing adjacent saidpilot extension and having restricted passages leading therefrom to 7said bore and thereto from said inlet connection respectively, saidnipple having an open outer end adapted for direct connection with themain gas line, a threaded needle valve in the pocket for regulating orshutting off the flow of gas through the said restricted passage leadingfrom said inlet connection to said pocket leaving open said restrictedpassage leading from said pocket to said bore, said plug having anarcuate peripheral slot and a cross passage therein, said restrictedpassages leading from the nipple to the bore and from the bore to thepilot extension being bridged by said arcuate slot and the said inletand outlet connections being in the path of movement of said crosspassage such that when the plug is rotated from a closed position to itsfirst active position a reduced flow of gas may flow direct from the gasline to said pocket and bore and thence through said arcuate slot intosaid outlet pilot light extension, the flow of gas to the outletconnection being blocked by the plug and such that when the plug isrotated to another active position a full volume of gas may flow fromthe inlet connection through the large cross passage into the plug toand through the outlet connection while reduced flow to said pilot lightextension continues.

2. In a valve for floor furnaces having a main gas supply line and apilot light and a burner in said line, a casing with a plug receivingbore, a plug having rotatable bearing in said bore, said casing havinginlet and outlet extensions leading to and from said bore respectively,said inlet extension being adapted for connection with said gas line andsaid outlet extension being adapted for connection with the mixing tubeof the furnace burner for conducting gas thereto, said casing having asecond outlet extension communicating with the plug receiving bore forconducting gas to the pilot light, a hollow threaded nipple on one sideof the casing forming a pocket, means for placing said pocket in directcommunication with the gas line, said pocket having a restricted passageleading to said inlet extension, a threaded adjustment screw adapted toregulate the flow of gas through said restricted passage to the pocketfrom the said inlet while permitting gas to flow into said pocket directfrom said gas line, said plug having an arcuate slot and a crosspassage, said slot placing said bore and pocket and said second outletextension in communication with each toher, and said first mentionedinlet and outlet extensions being in the path of movement of said crosspassage such that when the plug is rotated from a closed position to itsfirst active position a reduced flow of gas will flow from said pocketto the said second outlet extension, the flow of gas to the first outletextension being blocked by the plug, and such that when the plug isrotated to its second active position a full volume of gas may flow fromthe inlet extension through the cross passage in the plug to the firstoutlet extension while reduced flow to said second outlet extensioncontinues.

3. In a valve for floor furnaces having a main gas supply line and apilot light and a main burner in said gas line, a casing with a plugreceiving bore. a plug having rotatable bearing in saidbore, saidcasinghaving inlet and outlet extensions leading to and from said borerespectively, said inlet extension being adapted for connect on withsaid gas line and said outlet extension being adapted for connectionwith the mixing tube of the furnace burner for conducting gas thereto,

said-casing having a second outlet extension communicating with the borefor conducting gas to the pilot light, a nipple on one side of thecusing forming, a pocket and having an open outer end, means for placingthe outer end of the nipple in direct communication with the gas line,said nipple having a restricted inlet passage communicating with theinlet extension and a restricted outlet passage leading to the bore,threaded means mounted in the open outer end of said nipple forregulating the flow of gas from said inlet extension through saidrestricted inlet passage, said means only partially closing said openouter end whereby gas may flow direct to said pocket from said gas line,said plug having an arcuate slot and a cross passage, said slot placingsaid bore and pocket and said second outlet extension in communicationwith each other, and said first mentionedinlet and outlet extensionsbeing in the path of movement of said cross passage such that when theplug is rotated from a closed position to its first active position areduced flow of gas will flow from said pocket to said second outletextension, the flow of gas to the first outlet extension being blockedby the plug and such that when the plug is rotated to its second activeposition a full volume of gas may flow from the inlet extension throughthe cross passage in the plug to the first outlet extension whilereduced flow to said second outlet extension continues.

, 4. In a valve for fioor furnaces having a main gas supply line and apilot light and a main burner in said gas line, a casing with a plugreceiving bore, a plug having rotatable bearing in said bore, saidcasing having inlet and outlet extensions leading to and from said borerespectively, said inlet extension being adapted for connection withsaid gas line and said outlet extension being adapted for connectionwith the mixing tube of the furnace burner for conducting gas thereto,said casing having a second outlet extension communicating with the borefor conducting gas to the pilot light, a nipple on one side of thecasing forming a pocket and having an open outer end, means for placingthe outer end of the nipple in direct communication with the gas line,said nipple having a restricted inlet passage communicating with theinlet extension and restricted outlet passage leading to the bore, anadjustable screw valve mounted in the open outer end of said nipple forregulating the flow of gas from said inlet extension to said pocketthrough said restricted inlet passage, said valve having a head portionformed with a transverse slot and a communicating longitudinal slotleading to said pocket whereby gas may flow direct to said pocket fromsaid gas line, said plug having an arcuate slot and a cross passage,said arcuate slot placing said bore and pocket and said second outletextension in communication with each other, and said first mentionedinlet and outlet extensions being in the path of movement of said crosspassage such that when the plug is rotated from a closed position to itsfirst active position a reduced flow of gas will flow from said Pocketto said second outlet extension, the flow of gas to the first outletextension being blocked by the plug and such that when the plug isrotated to its second active position a full volume of gas may flow fromthe inlet extension through the cross passage in the plugto the firstoutlet extension while reduced flow to said second outlet extensioncontinues.

CASPER S. STUCKENHOLT.

